以下为句子列表：
英文: Liquid-phase oxidation methods, the most commonly used purification methods, have a number of shortcomings, such as high cost and the waste materials, which will pollute environment.
中文: 为了清除这些非金刚石碳，最常用的是若干种液相氧化法，但是存在有成本高，废料中含有可能污染环境的物质等缺点。
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